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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2d27d585e3a48da651e6510430ffa017d39770dc93441d153abff2ea1e27b5' 
  AND token = '4ov1oeuJCe1TO5dyM8tz/U4tHYkES9YYgRLbx3IsOBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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