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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4056d9428996bf6d05789d5ab990a7cf3fce9f0315b18de5bcf41326e248e4f0' 
  AND token = 'XId6GuQCP14WFjI/DZLW0X1DFTfwXFf+rE48cJQWdjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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