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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9b6c525e448131b63ab6ea5cd2d8e3d3c99ac6495e332298cc9b72bab457e3' 
  AND token = 'CRifpi+VxDt+1j9GyJg9il4KSolAcZ+dZ+KxTb8xGYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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