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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10047545af4c6eef953b0bd2d9e4843055c23b34ab6bc34bbdb20deaec63eadb' 
  AND token = 'OXMDltODxhJnN6Lj3oFOXsR7Nod+GneMnB7TBo0Fik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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