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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06c5f0306502bcb3fa906e20c7c4450b68b4130eabf958834f6dd6145ae0290' 
  AND token = 'TIYJ2DNrjy6JvmMKOwtr0I7hcoJ5buvahMv4nMuVY18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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