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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267a2fd77eea8d1bedb9f8bf7e525edf803cff6ff2fc9b2696e3258e9b78bd75' 
  AND token = 'DYTXav/52KN8M+VDDi2X0hbrH86cId4CXGMYQCi7C90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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