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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9ca353e11e53749486ffc6da434f334de1f7d1ab8b67208c0898b8c9e663a3' 
  AND token = '5laJngxUI7i9n3v1GXzDMgBbg7m8TXQD1ubVv/nf+OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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