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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8adada51bde4b1eb6ddd639de01be4920512d2cb4ac72602bb767aacc3d461b4' 
  AND token = 'y6JQi1OSaSnQF2IfE7p9pYQl0akbsMskEt43PQhJUqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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