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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b40d0b146b744228de9ce71d5cd64b2ade5d4618d68401a97f81abd5869037' 
  AND token = '04wrYMma1t4FEQLw5uWkH46cPgmwr59w1C06DIzF7ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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