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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c6225405c556fd8abfb92c2ac34bb9aec0d30d6fdc74b37d5ff7d61489e7f8' 
  AND token = '+VL2YWMJD7H9xzloxCr9mx7j3335FXqA3cELbVB+0l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}