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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9fc63539dfd3bc1176cbd5fe2ffe0e7618c0c194385c3189a87e925ee6d91a' 
  AND token = 'DG7+15CVVvTmuLPiH1Gf8t6eCbJuKwsC642xm7F4HzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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