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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792f9eb153c1c9ab71f6a2efd79fe7a0b10058874191e6c2e19deb772dd9973c' 
  AND token = 'QEvm7e8NKH0E6RqMPEXcLVtZRhA0QtmeK9fgzyg06VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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