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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb16cbea2b2c87ddc0ed1b9139230f2faff145190f9ac086ad337613a02314d' 
  AND token = 'JSbAQkhSGo6/sfb9JCy2UhO4zMKJ55uDZgsyaH9IBQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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