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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cac47feb4b9835c3081b5b5dab10290efebbcfaea964dbb6a8185eedc84ea5' 
  AND token = 'mfRSprPU/ToZBKil3kGBJxb8vV/7j1t+rPy0yIR16kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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