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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bb44bb0d15e49ea3f45441138c7776d06ad9c0e58145c08ef95bfa474fd02d' 
  AND token = 'LTFMNqJvZuld1t79qA7regpG7C3P4UnGDVm8DfwYiLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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