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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6910e27be6d4d36bf8197e86bc8c3d90eea7959d1ab018e096499ea65773a6e5' 
  AND token = 'hDsg6lgD+3JeMzZThIbsM/DW3qvit2I/MfeyxsoAYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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