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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ee7b075e0fce63daaa2e1a99aef75059586a916c539a4eae97046f52f6d5cf' 
  AND token = 'jlk0UWI/SVIAb44rNA1DFaiqGZ881cdZ2CP81kRLtf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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