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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20630604773d16bf686c96e010c9802bf537d1e96e516f125e98f699b885da69' 
  AND token = 'vF4gv95jmml5KY9+EGhTy6Q76U1F3WHS1S2iqETSfMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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