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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e57fc1fec23fe7121200ed41045e14ca5d70d255c5ca942488439b3eaadf68' 
  AND token = 'nTpJ4oQkMGBCQkKP/oxnvfnMsQm7OUdraSLjNl85rak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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