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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0e852d12fa67689421c18c15b1cc8a793b3ee9a93ea2ae75950c77d6123c31' 
  AND token = 'Oqzb6xpURqiCR395A65recAGKaByd52PsIxsy506NWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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