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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf85772c1851f41789c27dc57980a7b314e4ea214d73b48b6361146ef8d54509' 
  AND token = 'Kk5RIGpa8AIdubOsm6s8cwAuewHBG+9UdnrUnp+KYvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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