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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626c07b0a808a9ee072b5f456a6a47d50cf3047749b6f5868de8e8adf66cdafb' 
  AND token = '9+8nvFxn30+VOB6tR7q93Mlp0aHkNPs6xnjoudm2/IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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