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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02271205fb5519514898f83f7d85bcd63415add0fda7e8e2ddd082e7c00ee72e' 
  AND token = 'G7+WwjAyAgAAhCLOvgq2UUyzUNwuwPY+g0ng2VOwTnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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