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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96c040296e630218888d613888b4a4f4f4a99cb2f2a0fb6d89c3e6f0858c05f' 
  AND token = 'R+8N7AVAkwojWVHnhm1vaSKZ9IXcDL1DuYv+fIcIBJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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