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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6560c399e55a25291978d4f95301c8e7d5159921ab2dd6fe6394ffb536ef3b0c' 
  AND token = 'SezH+1MStdPs8R1P9CnSSW5vWMJU+5O6/Sg2SCNvLxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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