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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ead6dfa059ca46e4658e6da0e7c5988c67f082750d1cc64e01d58491291f6ef' 
  AND token = '3gfwbJMVh0CXRxaBbSKv2B6ioDSqVXW9/zeJoMN2D5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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