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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b1ee6f2daf5b85f88dc978fb8779276df10fb0d662f1e8ac5cf2130ebb7a86' 
  AND token = 'UGJr4Gl4c9CnF6hPusDxUN+3myn3Yidi4yy/OnCmkrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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