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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abcb46ce0ba52b66b0910176405c05be6aca82e1efa687dd73a6cf303d14f3a' 
  AND token = 'FOeLRB2zOkq0JBuI2GVpQNmhxaCaGp/LdV8unICfyYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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