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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1f915a5204fb950c928093fa4ce7504b7515be200c8c7f2f9e5111df6da962' 
  AND token = 'Q/eptSeFGyVllyct8ChonPmi6Y1OafoNaNnng9ynaak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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