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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec2b4e98a5aa55eccf1d45e44d282970f13393c13f2858c4678de816b9511ac' 
  AND token = 'U9kBSd5MJmSM9MIzPE2s4fcvgU3y8dYI78Z/EKdhy4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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