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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ee64b71211a6d1d5e61a5f26f4e321060b0704bd242110e781f6e5fcf70308' 
  AND token = 'jM8L51WQACBkS0nEwEukXUQ/ksQ1rTEJi3SL8qVThNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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