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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c08538f9e8a4a0eea83c28f5ca8f3dd9a1e1a5d0b890e300455456a7206e24' 
  AND token = 'AgEpmdWz037/O64lhF71ahCCn4apQzXENM7mg6+8G34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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