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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843b7bc1f6a5a5211a2f20fa4bb9596544f3a30dc2ed2606c445dc890f0a692b' 
  AND token = '6Czdfd0FGeZJIWy41mn6JLJPEmnA2TbnW11Q9dh33so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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