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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772c296bbf06e9e825a770bf44410d654383549a6ad8e3ca9a6f5129d5a5cb3a' 
  AND token = '6zmBlTQQyMFPVF09pwHH/X7my6Yx2gyditLVsdZ6xM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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