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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6956d9bcbe5e205ecd750bac53b81d98419d09bc94b2b2c99c384bc2a29308da' 
  AND token = 'VfpsDlJFRWGBrvwuxBICJQwLNO1jd+2lR8k6+wOq2Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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