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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061376e86556c162b4b2f4e8031d40a02ce7576ed5d74793b6f25070f2020976' 
  AND token = 'LDLn4R6xhPqLPLU+4GG3FE9XIsbpBlSKcT9wj/hCELc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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