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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ecb4a0530664a83ae2ce7c910e00644f7145cc18622f198587a64208ccc2a2' 
  AND token = 'UwbCNRF1LPVMkt0ZiT3/d9UYh054tqo3TGEF+ukx2Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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