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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d38ca6f0081a2292fac49ccb2405cbe0a0d15c4e7c9e067b994c53c1e4bd3fd' 
  AND token = 'k/FM5YJbfPVPEo3pP5HF/FBlTPkKqhEppfbOH8aH93k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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