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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2342a1b436d25ca40763583b42a42c4d6d545b9ce829196abb0dcdb3739670b0' 
  AND token = 'S9NuwUZ3Q/VsV2f6w7bAIuyKC5ASVzoqJoPYe7DN13g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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