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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb5438a9043135c1c4d8d1c3eb553c76546753434d5dfcd6d1ce2dbd5d4926b' 
  AND token = '/TE65NMNJ/8IZkB81s1gdfJpVFLKiJNqHzwzsIPUq3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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