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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a5a38f45077a8a99e5222d2f7d2b20a4b2d4891f182ad84d1c2e87bc9872c0' 
  AND token = 'owBmDgb2Hp3GzG7CEqvBTnTB1nNWfu1Q9jeY2E4HeNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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