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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b122514d931b9fcf1381c5bec3deba3388b7ce19764792843373847973e70e' 
  AND token = 'f+7tcxqRLIRXzx/4/4bzL33gMYWZPgDMKmt0cphlXfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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