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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba00ea380a0d6cbf550b2f31ed9dd63beaadd91861e04a682475b2abbb54140' 
  AND token = '0BcbZR+5ckGPgxt9OQwiDGRjtXESo7tkTBXvgANMP7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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