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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d8102e34483f6783fc3a0b06e89216b78a4fe1c07316c0d42a7103f492e75c' 
  AND token = 'XbfLkARb29zppXF3nJnTm7Sd9+YwtCjrimy60M1I3Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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