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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5399ed803152867a3835dc51ce433b2b39346a1da1928363e917b0735931a7' 
  AND token = 'ESWppMjKO3DkIe+zWwbVlUEm88/Hy1+vGH3y3c8IE64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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