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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342132d6e3731fc3a040d315199bcb29f965bd57592cc28e525a5dd1b3d2d35a' 
  AND token = 'xOK4cChyP6f+/smJnORDgWfAmXQaEMpJvg7Sk6/Q9E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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