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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27070c109b2c1c98793875497e3512290ccfe3f47231057ae07d93a959164080' 
  AND token = 'qnnCGCQVOJ1p1isn0fZl+wt464vgO2VLN9cVOL2FMa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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