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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f0ceaf4f419b95394df2ba409b06c7f91f0e3a88b99fca34b264687b0b20f1' 
  AND token = 'tisHbykZqMA6qk1CrzfRFLtiKxe9KCnK9GRJT3chelQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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