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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bb4eaf0f9c9e376ec02ab5e9efe8f6485a1aa6d2413cb5d4d18ad46528a7df' 
  AND token = 'IBQHWI0HUZo+XyRDiu4tc8SnX1Jp5aai+Jgb8DjytYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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