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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ac43bfe61d10a1e601a21d6d0b6657f734eb8111a2044643f573e1d533bc33' 
  AND token = '7qaRyAnqvwsDLOtKNzqEmVaS6+3JYYKW+qxxG9SDrKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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