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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97816ac4de96c2638d43ed906516164649e4a0f74d0eb6ac76be8503d36d6ae9' 
  AND token = 'gKqU7HpfeDdktypHpSjobHsfAoOIV6Cs6HjuTcyBOho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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