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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08322838ba3d6d7238be5e2b4c1bce34e9b664e25a337e51886b2b4ce0f04261' 
  AND token = 'ebysoVwqwBqVMentSdz7fS03hNAmP5J9oOzKO7dlKT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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